关于gas pressure
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发布时间：2023-04-15 06:19
共1个回答
热心网友
时间：2023-11-05 17:39
then倒转佢
d水都唔fall out
因为有air pressure balances the weight of water 当我地将玻璃杯例转既时候
由于地心吸力
D水就会流晒出黎
但系点解我地加一张卡纸比佢
D水就唔会流出黎呢 要做到D水唔流出黎
我地就要有一个相同大细
不过相反方向既力比佢
而果个力F
就系你所讲既air pressure 图片参考：i.imgur/eo5Ea 空气就好似一条弹弓咁样
当你拉长或压缩佢既时候
佢就会比一个力
将佢自己变返原来既大小 当你倒转个杯既时候
D水会向下流出黎
水会将卡纸同杯之间既空间封住
咁就冇空气入到去喇 当少部份水流出个杯
由于冇空气入到去
原来入面既空气就会被拉长
咁就会有一个力拉返D水入黎 当依个力同水既重量一样既时候
D水就唔会再流出黎喇 图片参考：i.imgur/5TkFO 咁点解冇卡纸既时候
水会流出黎呢? 因为冇左卡纸
空气就可以走入去
原来杯入面既被拉长既空气(低压既空气)就会因为新加入既空气变返正常气压 冇左果个力F
水就可以继续流出黎喇 不过atmospheric pressure咁大
点解佢唔会劲到整凹埋张纸??? 图片参考：i.imgur/cXkT4 上面系一张卡纸既放大图
系卡纸入面有好多空间
都系充满住空气 虽然卡纸外有气压打算整凹张纸
但系纸入面同样有气压想整凸张卡纸 两个力相同
所以张纸只会维持原状 不过
虽然气压系好大
但系张纸既硬度足以承受依一个力
咁就唔会凹喇 (2)又有个实验话倒转个空杯插落水度
d水都唔会入去个杯入面 点解会咁???又点解打斜插就ok?? 因为空气既密度比水既密度低
所以空气系冇其他力比佢既时候系会向上升既 空气就唔会又杯入面向下降再浮出水面喇 空气占有空间既
咁杯内既空间完全被空气占有住既时间
水又点入去呢? 不过只打斜个杯
空气就出到黎
而水亦有空间比佢入去喇
Q1: 不过atmospheric pressure咁大
点解佢唔会劲到整凹埋张纸??? It is because water is almost inpressible. The air pressure acts on the card and the pressure is trmitted to the water inside the cup. Due to the inpressibility of water
its volume could not be reced. Hence
the card would not be pushed inward towards the water. Q2: 又有个实验话倒转个空杯插落水度
d水都唔会入去个杯入面 点解会咁???又点解打斜插就ok?? In fact
there is some water that goes into the cup because the water pressure outside the moth of the cup is greater than atmospheric pressure.. The water would then press the air and increases the air pressure inside the cup. A stage is then reached when the increased air pressure equals to the water pressure
no more water could enter into the cup. When the cup is tilted
the increase in air pressure in the cup forces the air itself to go out. Thus giving space for the water to go into the cup.
